Featured Images don’t load

I purchased this theme a couple of days ago and can’t figure out how to get the featured image to load. It shows the little symbol that means a picture is broken.

If I switch to a different theme they will show, and when I switch back to Blackfyre they don’t load.

I verified the folders/files are set to 755/644.
I thought maybe the PHP version could be an issue so I uninstalled PHP 8 and installed PHP 7.4 but the issue persists.
I verified all the dependent plugins are installed.

I tried using all versions of the included homepage and it happens on all of them.

Please let me know what else I should be checking.

Thanks